docs: def addComment(self, comment):
          """ adds a comment to a given item.  Must be authenticated """
          url = "%s/addComment" % self.root
          params = {
              "f" : "json",
              "comment" : comment
          }
          return self._post(url, params, proxy_port=self._proxy_port,
                               securityHandler=self._securityHandler,
                               proxy_url=self._proxy_url)